[Elecraft] KPA100 CAL tPA

Thu Jul 25 20:52:02 2002

Hi

The heatsink calibration is done from the menu not the bias control R6. I=
f the calibration is not set right the fan may not turn off. You need to =
measure the heatsink temperature and set the menu setting to the same val=
ue. I use a Fluke temperature meter with a thermocouple held against the =
heatsink to measure the temperature. If you don't have this setup then yo=
u could lay a thermometer on the heatsink and read it that way or put the=
 radio in a room where the temperature is known for one or two hours turn=
ed off to allow the heatsink to adjust to the room then turn on the radio=
 and set the menu value quickly before the heatsink changes due to heat f=
rom the radio.

Don Brown
KD5NDB

4 K2's
3 K1's
all options
2 KPA100's =20

----- Original Message -----
From: [email protected]
Sent: Thursday, July 25, 2002 6:48 PM
To: [email protected]
Subject: [Elecraft] KPA100 CAL tPA

Can anyone tell me if it is possible to recalibrate the temperature setti=
ng
so the fan doesn't run unnecessarily without turning the bias control, R6=
,
back to counter-clockwise.  This may be a futile cause since the fan will
switch to HI at a heatsink temperature of 40C and will turn off within 2 =
to 4
minutes after going below 37C.  Mine doesn't seem to cut off at 37C (100F=
)
because it runs a long time after the heatsink fins feel cool (near room
temperature, 25C or 78F).  Roy Morris  W4WFB
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